Finally found the issue!
I had recently cleaned the taillight lenses, and popped the bulbs out to check for corrosion.
The rubber/plastic shielding on the wire going to the brake light had moved over enough to short against the bulb housing, causing a dead short.
After messing and checking the right taillight and wiring, I went to the left one and found the culprit. Shrunk wire shielding.
I used that liquid black tape stuff, and also put a piece of silicon model airplane fuel line around the bad area, so it's impossible for this to happen again,,,,at THIS spot.
The wiring on the car is ancient. As the car is not restored, I'm going to just run end enjoy, and fix as necessary, any more wiring issues (knocking on wood).
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